he'll be back next week for the vice presidential debate. >> thanks so much. >>> starting tomorrow , president obama and mitt romney weigh in on the issues in an exclusive presidential forum right here on cbssf.com. >>> a man sitting on the cal train tracks in the south bay is hospitalized this evening not because he was hit by a train, he was shot by police. why recovers say they felt compelled to open fire. >> reporter: he was acting erratically, strangely, and police say when they first contacted him, he was laying across the tracks. video from chopper 5 shows clothing and other items strewn about the crime scene. >> it was not necessarily what you would call a typical foot-pursuit. it lasted several minutes. >> reporter: a man was spotted wandering on the tracks. san mateo county sheriff's deputies provide security for cal train and ordered the man to stop, but he kept walking. they walked more than a quarter-mile down the track. by the time backup got there, he armed himself with a metal spike. >> the suspect displayed some type of threatening behavior toward the officers that t